Here is a abstract blue background vector graphic, includes a eps file.

Name: Abstract Blue Background Vector GraphicHomepage:Background VectorLicense: Creative Commons Attribution 3.0File Type: EPS
This image is a scalable vector graphic and can be scaled to any size without loss of resolution. This image will download as a .eps or ai file. You will need a vector editor to use this file (such as Adobe Illustrator or CorelDRAW).